Why participate in the 1st place? Given the context, it turns out "I don't do groups" was easily (and not unreasonably) overinterpreted.
Probably because the OP finished off his post by asking:
(and I quote)
"So how good are you? "
That's (IMHO) a fair question & I gave him a fair and honest answer.
My abilites allow me to not "do groups".